Riveting device

ABSTRACT

A RIVETING DEVICE INCLUDING A YOKE TO EXTEND AROUND WORK PIECES TO BE RIVETED, A PRESSURE ACTUATED CLAMP AND A PRESSURE ACTUATED RIVET FORMER, THE PRESSURE ACTUATED CLAMP AND RIVET FORMER BEING SECURED TO ONE SIDE OF SAID YOKE AND ACTUATING AGAINST THE OTHER SIDE OF SAID YOKE.

June l, 1971 H, w, MURDQCH ETAL 3,581,373

RIVETING DEVICE Filed Dec. 20, 1968 5 Sheets-Sheet 1 R0 /E WM wu o n Q WMH fw lr mD, if QN hy W MJn 6&0

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h) E( i *1 kf s INVENTORS Henry W Murdoch Martn. D. Hazan June l, 1971 H, w, MURDQQH ETAL 3,581,373

RIVETING DEVICE Filed Dec. 20, 1968 5 Sheets-Sheet :5

E l E vNvENToRs Henry W. Mura/ach Maf-tn D. Hazan, By

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United States Patent O U.S. Cl. 29-243.54 16 Claims ABSTRACT F THE DISCLOSURE A riveting device including a yoke to extend around work pieces to be riveted, a pressure actuated clarnp and a pressure actuated rivet former, the pressure actuated clamp and rivet former being secured to one side of said yoke and actuating against the other side of said yoke.

SUMMARY The present invention relates to an improved riveting device.

An object of the present invention is to provide an improved riveting device which forms or sets rivets by squeezing rather than by impacting.

Another object is to provide an improved riveting device having separate and substantially independently operated pressure responsive clamping and rivet forming and setting means.

A further object is to provide an improved riveting device operable by one person to clamp work pieces to be riveted and to rivet the work pieces together.

A still further object is to provide an improved riveting device in which the highest force to be exerted on the rivet may be preselected.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects and advantages of the present invention are hereinafter set forth and explained with reference to the drawings wherein:

FIG. 1 is an end view of the improved riveting device of the present invention.

FIG. 2 is an elevation view of the riveting device partly in section showing both the clamping and rivet forming means withdrawn.

FIG. 3 is a partial sectional View of the riveting device showing the clamping of work pieces.

FIG. 4 is a partial sectional view of the riveting device showing the forming of the rivet.

FIG. 5 is a schematic diagram of the pneumatic-hydraulic control system for the riveting device.

DESCRIPTION OF THE PREFERRED EMBODIMENT The riveting device as shown in the drawings includes body 12 with the yoke 14 secured to one end thereof. The handle 116 is secured to the opposite end of the body 1.2 and supports the manual control valves 18 and 20. The yoke 14 is generally C-shaped and has one end secured to the body 12 and the opposite end has the setting die 22 directly opposite from the yoke end of body 12. Thus, the work pieces 24 and 26 which are to be secured together by the rivet 28 are positioned between the ends of yoke 14 with the head of rivet 28 in the setting die 22 and the distal or unformed end of rivet 28 extending through the work pieces 24 and 26 toward the body 12.

Yoke 14 defines a bore through which the smaller end of body 12 extends. Snap ring l30 which engages in the groove 32 around body 12 and the spring loaded plunger 34 in yoke 14 which engages in groove 36 around body 12 retain yoke 14 on body 12. With this means of securing yoke 14 to body 12, the body 12 is free to rotate within Patented June ll, 1971 yoke 14. This allows the yoke 14 to be positioned for the convenience of the work pieces 24 and 26 and body 12 to be positioned for the convenience of the operator.

The riveting device 10 also includes a clamping means, a rivet forming means and actuating means for said clamping and forming means. The body 12 is hollow having the bore 35 at the yoke end, the enlarged bore 37 and the reduced bore 39 `through which tube 41 extends. Within the bores 35 and 37 are positioned suitable pressure chambers for providing the clamping and rivet forming forces as hereinafter explained.

The clamping means includes the sleeve 38 which is slidable within the reduced lbore 35 of body 12. As can be seen by comparing FIGS. 2 and 3, sleeve 38 moves from its retracted position (FIG. 2) to its clamping position (FIG. 3). Sleeve 38 engages work piece 26 to clamp the work pieces 24 and 26 against setting die 22. Because sleeve 38 is tubular it engages the work pieces around rivet 28 and therefore holds the work pieces against the setting die and allows the forming die 40 to be moved through sleeve 38 to engage and form the projecting end of rivet 28. Forming die `40 is secured to the outer end of piston 42 which is slidably mounted in body 12 and adapted to slide through sleeve 38 to the rivet forming and setting position of die 40 as shown in FIG. 4.

Sleeve 38 moves responsive to the pressure differential across the internal rib 44 on sleeve 38. Passage 46 communicates through piston 42 between pressure chamber 48 on one side of rib 44 and the central chamber 50 defined by piston 42. Passage 52 communicates through piston `42 between pressure chamber 54 on the opposite side of rib 44 and the annular chamber 56 defined between the flange 58 on the end of piston opposite forming die 40 and the enlarged bore in body 12. The pressure difierential across rib 44 therefore is controlled by the fluid pressure supplied through fitting 60 to annular chamber 56 and by the fluid pressure supplied through line 62 and tube 41 to central chamber 50. When the pressure in chamber 48 exceeds the pressure in chamber S4, sleeve 38 moves toward clamping position. When the pressure in chamber 54 exceeds the pressure in chamber 48, sleeve 38 moves toward retracted position.

The movement of piston 42 is responsive to the forces on piston 42 resulting from the fluid pressures in central chamber 50, annular chamber 56 and annular chamber 66 on the opposite side of flange 58 from chamber 56. Fluid pressure is delivered to chamber 66 through line 68 under suitable controls as hereinafter described. Piston 42 is provided with suitable packing and seals to seal against the interior of both bores 35 and 37 in body 12, the interior of sleeve 38 and the exterior of tube 41. As shown tube `41 extends through body 12, is suitably sealed in bore 39 and is held against movement outwardly by the shoulder 70.

Since it is desired that actuation of sleeve 38 and piston 42 be substantially independent of the other, a fluid such as air is supplied under pressure to chamber 56 and hydraulic fluid under higher pressure than the air pressure is supplied to chambers 50 and 66. The effective pressure area of the piston 42 exposed to pressure in chamber 48 is greater than the effective pressure area of the piston 42 exposed to pressure in chamber 50. Since both of these chambers are exposed to the same pressure the slight effective area difference results in a force urging piston 42 to the left as viewed in the drawings. This differential assures that the piston 42 does not engage the rivet 28 during the clamping cycle even if the air pressure in chambers 54 and 56 is lost completely. The hydraulic fluid is supplied through line 68 under pressure control which is preselected to relieve the pressure in chamber 66 once such preselected pressure has been reached as hereinafter explained. This allows the maximum force exerted on rivet 28 to be preselected.

The pneumatic-hydraulic control system illustrated in FIG. is a suitable control system for controlling the actuation of the rivet device 10. The system is supplied with compressed air from a suitable source (not shown) through line 72 to manifold 74 under control of valve 76 and with suitable lubrication and pressure regulation as shown. Valve 78 controls the flow of air from manifold 74 to the hydraulic pump 80 in the hydraulic portion of the system. The valve 82 controls the ow of air from the manifold 74 to the pneumatic portion of the system. Air is supplied through normally open valve 84 to one end each of the cylinders 86, 88 and 90. Cylinder 88 represents the squeeze or piston portion of riveting device 10 while cylinder 90 represents the clamping or sleeve portion of riveting device 10. Cylinder 86 is utilized to control bleed valve 92 as hereinafter explained. Air pressure is conducted to the valves 18, and 94.

Thel pump 80 delivers hydraulic iluid to valves 96 and 98 under control of pressure relief valve 100. Valve 96, controls the flow of hydraulic fluid to cylinder 90 and is controlled by cylinder 102 responsive to operation of valve 20. Valve 98 controls the flow of hydraulic uid to cylinder 88 and is controlled by cylinder 104 responsive to operation of valve 94. Hydraulic fluid between valve 98 and cylinder 88 is conducted through relief valve 106 to cylinder 86 as hereinafter described.

In operation, the riveting device 10 is provided with air under pressure through valve 84 in chambers 54 and 56 which pressure is sufficient to assure that both piston 42 and sleeve 38 are retracted. The work pieces 24 and 26 with the rivet 28 extending therethrough are then positioned in the yoke 14 with the head of the rivet 28 in the setting die 22.

To clamp work pieces 24 and 26 in such position, the operator actuates the valve 20' which moves cylinder 102 to actuate valve 96 to deliver hydraulic fluid through line `62 to chambers 48 and 50 causing sleeve 38 to engage and clamp the work pieces against setting die 22. If the operator is not satised with the clamped position he may reverse valve 20 to relieve chambers 48 and 50 whereby the air pressure in chamber 54 causes sleeve 38 to retract. It should be noted that while sleeve 38 moves substantially independent of piston 42, when the rib 44 on sleeve 38 engages the ring 43 on piston 42, both sleeve 38 and piston `42 move toward the work pieces 24 and 26 until they are clamped in position.

With the work pieces properly clamped, valve 18 is actuated to direct hydraulic fluid through line 68 into chamber 66 whereby piston 42 is actuated. The opening of valve 18 delivers air pressure through the check valve 108 to the valves 84, 94 and 92. Pneumatic pressure in this system is trapped by check valve 108. Valve 84 is actuated by this pressure to relieve the air pressure from chambers 54 and 56. This pressure actuates valve 94, moving cylinder 104 to open valve 98 delivering hydraulic liuid through line `68 to chamber 66 and also to relief valve 106 which is preset to open at a preselected maximum desired pressure. The hydraulic pressure in chamber 66 moves piston `42 toward the Work pieces.

As piston 42 moves, the excess of the hydraulic fluid displaced from chamber 48 to chamber '50 is returned through line 62 and valve 96 and is returned to the reservoir. As the die 40 engages the end of rivet 28 the force exerted on piston 42 is sufficient to form and set rivet 28. This type of riveting which results from the increase in pressure provides a preferred rivet joint as compared to the multiple impact type of riveting. When the riveting is completed, the pressure in chamber 66 reaches the preselected release point and is released through valve 106 to cylinder 86 and to the hydraulic reservoir. Actuation of cylinder 86 opens valve 92 to relieve pressure in the system supplying air pressure to valves 84 and 94. Then 4 valves 84 and 94 return to their original position causing valve 98 to close.

In this position the riveting has been completed and air pressure is supplied through valve 84 to chambers 54 and 56 to return piston 42 to its retracted position. The clamping sleeve 38 is retracted by reversing valve 20 which reverses cylinder 102 moving valve 98 to a position connecting line 62 to the hydraulic reservoir. This completes the riveting cycle and the device may be moved into the next riveting position.

From the foregoing it can be seen that the improved riveting device of the present invention is easily operated having only two hand controls with a preselected adjustment setting the maximum riveting force applied. The iiveting device has substantially separate clamping and rivet setting and forming means so that the clamping means can be set and released if desired without actuating the rivet setting means.

What is claimed is:

1. A riveting device comprising a body,

a pressure responsive sleeve slidably mounted in said body,

a pressure responsive piston slidably mounted in sald body independent of said sleeve,

a rivet forming die connected to said piston,

means connected to said body to support received work pieces to be riveted having a rivet extending through the work pieces,

means for supplying pressure uid to said sleeve to move said sleeve independent of said piston into clamping engagement with the work pieces, and

means for supplying pressure lluid to said piston to move said piston independent of said sleeve and apply said rivet forming die thereon into engagement against said rivet with force suicient to form and set said rivet in the work pieces thereat.

2. A riveting device according to claim 1 including means for relieving the pressure fluid supplied to said piston when the pressure reaches a preselected pressure.

3. A riveting device according to claim `1 wherein said piston is slidable within said sleeve whereby when said sleeve clamps said work pieces said piston engages the projecting end of the rivet within said sleeve and sets said rivet in said work pieces.

4. A riveting device according to claim 1 including means for supplying air pressure to said sleeve and said piston to urge said sleeve and said piston toward their tretracted positions.

5. A riveting device according to claim 4 including means for relieving air pressure on said sleeve and said piston rwhen pressure fluid is delivered to said piston.

6. A riveting device, comprising a body,

a yoke, having one end secured to said body and the other end spaced from said one end,

a pressure responsive sleeve slidably mounted with respect to said body to move toward and away from the end of said yoke away from said body so that members to be joined may be clamped between said yoke end and said sleeve,

a rivet forming die,

a pressure responsive member reciprocally mounted in said body independent of said sleeve,

said rivet forming die being secured to said pressure responsive member,

means for supplying fluid pressure to said pressure responsive sleeve to move said sleeve independent of said pressure responsive member, and

means for supplying fluid pressure to said pressure responsive member to move said member independent of said sleeve for forming a rivet between said opposite end of said yoke and said rivet forming die.

7. A riveting device according to claim 6 wherein said yoke is pivotally mounted around said body.

8. A riveting device according to claim 6 including a rst control valve mounted on said body and adapted to control the lfluid pressure supplied to said sleeve, and a second control valve mounted on said body and adapted to control the uid pressure supplied to said pressure responsive member.

9. A riveting device comprising a body having a first bore and a larger second bore,

a sleeve slidably mounted in said rst bore of said body,

a piston slidably mounted in said second bore of said body and extending within said sleeve slidably independent thereof,

said sleeve and said piston when extended adapted to be partially outside said body,

support means for supporting received work pieces to be riveted,

means for supplying a pressure uid to said sleeve to actuate said sleeve independent of said piston to extended position clamping work pieces against said support means -with the projecting end of a rivet extending through the work pieces being within said sleeve, and

means for supplying a pressure uid to said piston to actuate said piston independent of said sleeve into riveting position within said sleeve and engaging the projecting end of the rivet to form and set the rivet in the work pieces.

10. A riveting device according to claim 9 wherein said sleeve and said piston define a first and a second pressure chamber,

uid pressure in said rst chamber moving said sleeve to extended clamping position and said piston to retracted position,

said piston and said body dene a third and a fourth pressure chamber,

fluid pressure in said third chamber moving said piston to extended rivet forming and setting position.

11. A riveting device according to claim 10 including means for supplying air pressure to said second and fourth chamber to urge said sleeve and said piston toward their retracted positions.

12. A riveting device according to claim 11 including means for relieving air pressure from said second and fourth chambers Iwhen pressure uid is supplied to said third chamber.

13. A riveting device according to claim 12 including means for relieving pressure uid from said third chamber when the pressure therein reaches a preselected maximum pressure.

14. A riveting device according to claim 13 including means associated with said pressure uid relieving means to shut oit said air relieving means when pressure in said third chamber is relieved whereby the air pressure is supplied to said second and fourth chambers to retract said piston.

15. A riveting device according to claim 14 wherein said sleeve moves substantially independently of said piston, and

the air pressure in said second chamber urging said sleeve toward a retracted position whereby when iluid pressure is relieved from said rst chamber said sleeve retracts from clamping position responsive to air pressure.

16. A riveting device, comprising a body,

a yoke, having one end pivotally mounted around said body and the other end spaced from said one end,

a pressure responsive sleeve slidably mounted with respect to said body to move toward and away from the end of said yoke away from said body so that members to be joined may be clamped between said yoke end and said sleeve,

a rivet forming die,

a pressure responsive member reciprocally mounted in said body,

said rivet forming die being secured to said pressure responsive member,

means for supplying uid pressure to said pressure responsive sleeve, and

means for supplying fluid pressure to saidk pressure responsive member for forming a rivet between said opposite end of said yoke and said rivet forming die.

References Cited UNITED STATES PATENTS 45 HARRISON L. HINSON, Primary Examiner U. Cl. X.R. 

